| 摘要 |
Remotely interrogating a passive sensor having resonator(s) includes interrogating the resonator over a frequency range determined by the design of the resonator; interrogating the resonator at a first frequency and a second frequency; determining the amplitude difference between the two signals, where the difference is positively or negatively signed; and allowing a first resonant frequency, controlled by the signed amplitude difference, to be defined. Remotely interrogating a passive sensor having resonator(s) comprises: (A) interrogating the resonator over a frequency range determined by the design of the resonator, allowing for the rapid determination of a resonant frequency response centered on a preliminary resonant frequency (fr-0) located between a lower preliminary frequency (fr-pi) and a higher preliminary frequency (fr-ps) defined at the half-maximum of the resonant frequency response of the resonator by detecting the amplitude of the response signal of the resonator; (B) interrogating the resonator at a first frequency (f-11) and a second frequency (f-21) such that f-11 is equal to (fr-o-f-m) divided by 2 and f-21 is equal to (fr-o+f-m) divided by 2, with f-m which is less than (f-ps-fr-pi), and allowing a first couple of amplitudes (Pf-11, Pf-21) of first and second reception signals to be defined; (C) determining the amplitude difference (delta (Pf-11-Pf-21)) between the two signals, where the difference is positively or negatively signed; and (D) allowing a first resonant frequency (fr-1), controlled by the signed amplitude difference, to be defined and having the fr-1 which is equal to fr-0 plus K*[delta (Pf-11 -Pf-21 )-Ca'], where Ca' is a control set-point and K* is a constant. The steps (B)-(D) are reiterated and an (i+ 1)th resonant frequency (fr-(i+1)) from an ith resonant frequency (fr-i) is defined as fr(i+1) which is equal to fr-i plus K*[delta (Pf-1i-Pf-2i)-Ca'] to obtain a determined resonant frequency (fr-(i+1)) such that the signed amplitude difference (delta (Pf-1i-Pf-2i)) is equal to the control set-point (Ca'). |
